[Python-Dev] Re: A proposal to modify `None` so that it hashes to a constant

On Tue, Nov 29, 2022 at 01:34:54PM +1300, Greg Ewing wrote:

I got the impression that there were some internal language reasons to want stable dicts, e.g. so that the class dict passed to __prepare__ preserves the order in which names are assigned in the class body. Are there any such use cases for stable sets?

Some people wanted order preserving kwargs, I think for web frameworks. There was even a discussion for a while about using OrderedDict for kwargs and leaving dicts unordered. For me, the biggest advantage of preserving input order in dicts is that it is now easier to write doctests using the dict's repr. It would be nice to be able to do the same for sets, but not nice enough to justify making them bigger or slower. -- Steve